Automatic light-control apparatus for photographic-printing machines



Jul 29 1924.

4. 5 2 0 l L L w o H AUTOMATIC LIQHT CONTROL APPARATUS FOR PHOTOGRAPHIC PRINTING MACHINES Filed July 25. 1921' 5 Sheets-Sheet 1 frwefifir 4/0621 6. Mwaf/ B M WM.

July 29, 1924.

A. s HOWELL AUTOMATIC LIGHT CONTROL APPARATUS-FOR PHOTOGRAPHIC PRINTING MACHINES 1921 5 Sheets-Sheet Filed July 25 MEI July 29, 1924. 1,502,954

A. s. HOWELL AUTOMATIC LIGHT C QNTROL APPARATUS FOR PHOTOGRAPHIC PRINTING MACHINES Filed July 25 .1921 5 sheets-sheet 4 lime)??? 4/3627 8. flame/l By? @Mc (2W3.-

Jul 29 1924.

A. S. HOWELL AUTOMATIC LIGHT CONTROL APPARATUS FOR PHOTOGRAPHIG PRINTING MACHINES 5 Sheets-Sheet 5 .V M. L I, M \i b $4 Y M \/n [l i1 m A Aw A A \M\ T HHHJ M 1L T m I k A A i Av H H W M r 4 n m 1 l m A. fit F r Q N\ MNQ N@\ m v l Q QM N f N\ s M x xi Q Q 1 vi A 1 T M\ WEN H H N m H A n T m n n m n T n n n n 4 1 n 1 n n n n n n n A T 1 n n A A V A W L! @@@@@kk@ TS A Ag NS wgmm Patented July 29, 1924.

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ALBERT HOWELL, OF CHICAGO. ILLINOIS, ASSIGNQR 'I'O BELL 8: J11:

PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF IILINGIL.

AUTOMATIC LIGHT-CONFROL APPARATUS FOR FHOTOG-RAPHIQPRIN TING Application filed July 25, 1921. Serial No, 487,225.

To all 71. from it may concern Be it known that I, ALBERT S. HOWELL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and .useful Improvement in Automatic Light- .Control Apparatus for Photographic- Printing Machines, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of the specificat-ion.

My "invention relates to automatic light control apparatus for photographieprinting machines especially motion picture film printing machines and relates particularly to such apparatus in which not only does a fed master control element, such as the negative film, control the points during the printing operation when the light changes aremade but also controls the degree to which the light is changed as has been heretofore proposed.

The main. feature of my invention relates to the provision of mechanism of the above described character which is well adapted 'toperform its functions under practical conditions and in which the control of the light change apparatus during each light change is effected at one point in the travel of the control member and is not extended over a portion of the feeding movement of the control member whereby the light changes may be made in extremely quick succession. i I I With this and other features in view my invention consists in' certain features of novelty in the construction, combination, and arrangement of parts by which the said Figure 2 is an enlarged section." of part" of the machine on the line 22 of Fig. 1.

features and certain other features hereinafter appearing are effected. all as fully F igureS is an enlarged view taken on the line 33 of Fig. 1.

Figure at is a partial section on the line 44 of Fig. 3.

Figure 5 is a perspective view of the film advancing. member of the machine.

Figure 6 is a partial section on the line 66 of Fig. 3.

' Figure 7 is a perspective view of certain parts of the adjustable shutter device and related parts partially broken away.

Figure 8 is an enlarged section on the line 8-8of Fig. 1. v

Figure 9 is an enlarged partial section of a portion of the mechanism in elevation similar to Fig. 1.

Figure 10 is a perspective view of a portion of the shutter adjusting mechanism.

Figure 11 is an enlarged section of another portion of the shutter adjusting mechanism. I

Figure 12 is a diagrammatical view of the electrical devices of the machine and the circuit connections therebetween.

' Figure 13 is a perspective view of a p01 tion of the negative film.

Figure 14 is a reduced section on the line 14-14 of Fig. 2.

Figure 15 is a section 'on the line 15-45 of Fig. 13.

Like characters of reference'indicate lik parts in the various views. v

In the said drawings 1 designates a standard on the top ofwhich is secured a hollow casing 2 having across partition 3 dividing the main enclosure of the easinginto front-andrear chambers, the front chamber forming a' lamp chamber 4 and the rear chamber 5 forming an enclosure for a driving motor 6 which is secured therein. The casing 2 has an extendingportion 7 which extendsforwardly from the front wall of the lamp chamber and forms an enclosure opening forwardly. The upper wall ofthe extending portion 7 is formed 'to provide a square enclosingg uide 8 ex- "tending m a forward and rearward direct 'tion'and communicat ng 'atlts rear end with the lamp chamber 40 Telescope'd with this guide for sliding movement in a forward 10 secured to guide Pivoted to the plate 10 at the opposite side thereof is an arm 13 at the free end of which a headed stud 14 is mounted ,for axial movement ina forward and rearward directionv when the arm is-in operative position,as shown in Fig. 2., When the arm is in this position the head of the stud registers with a depression 15 in the forward face of the plate .12, and the stud is yieldably pressed rearwardly by a compression spring 16 encircling the shank of the stud and abutting the head thereof and a rearwardly facing shoulder formed by an'enlargement of therear portion of the bore in which the stud is mounted. Thusthe plate 12 is yieldably pressed toward the plate 10. .A knob 17 is the forward end of the shank of the stud 14, which extends forwardly "of the arm, so that the stud may be manually withdrawn from the depression 15 and the arm 13 swung away from the plate 12 to permit this plate being swung away from the plate 10. Both plates have rectangular openings 18 therethrough'of the size of one picture ofa motion picture film and registering with theaforementioned opening of the element 9.

Covering the j forward end of the opening 18 of the plate 12 to prevent the passing of actinic light through the opening is a ruby glass 19, it being secured to the forward face of the plate 12 by an'annular frame 20 in a usual manner. I

A pair of vertical parallel guide ribs 21 project from the forward .face of the plate 10 and are disposed on opposite sides of the opening 18. These ribs enter respective ver-f tic-a1 grooves formed in the rear face of the plate 12 and form side film guides.

The upper wall and the top portions of the side walls of the portion 7 do not extend forwardly as, far as the main portions of the side walls and the bottom wall'thereof, see Fig. 1, and a vertical plate 22 is secured to the forward edges of the main portion of these side walls and the bottom wall, this plate being disposed just to the rear of the guide plate 10. A plate-23 is mounted for vertical reciprocating ncrement between the side walls of the portion 7 and between the plate 22 and vertical guide ribs 24 formed onrthe innrsurfaces respectively of these side walls. A 'horizontal plate 25 is disposed on top of a spacing block 26which is disposed on top of the plate 23,. and these parts are secured together by means of headed screws 27 passing through vertical holes in the plate '25 and block 26 and screw threaded into the plate 23. See Fig. 3. The plate 25 is dispose'd below the element 9 and has a pair of horizontally spaced forwardly projecting pins 28 which project through an opening 29 in the plate 10 and perforations of superposed negative 'and positive films 30 and 31, between 'tlie'plates 10 and 12 and guide ribs 21, and into-a depression 32 in the rearward face of the plate 12 when the film guide comprising plates 10 and 12 is of the pins from one end of their stroke to the other.

The motor 6' is disposed axially in a forward and rearward direction, and a shaft 35 is journaled in the front wall of the lamp chamber4 and in the partition 3 in axial alinement with the motor and'is driven by the motor in a clockwise direction in Fig. 3 through a friction coupling 36 of usual construction. Secured upon the shaft 35 I within the enclosure ofthe portion 7 of the casing is acam cylinder 37. Formed on the forward .end of this cylinder is a cam 38 which is engaged at diametrically opposite pointsby a pair of, vertically spaced cam rollers 39 rotatably mounted on respective studs 40 secured to the plate 23, where 1 by the plate 23 is reciprocated vertically when the cam cylinder is rotated. A vertical lever 41 is pivoted at an intermediate point 42, on a horizontal axis-normal to the axis of the shaft 35, on an extension 43 extending forwardly from the front wall of the lamp chamber within the enclosure of the portion 7. A cam roller 44 is rota-tably mounted. on the lower, end of this lever and engages a drum cam 1 groove 45 formed in the cam cylinder 37 See "Fig. 1. The upperend of the lever 41 extends through an opening 46 in the upper wall of. the portion 7 alongside of the guide 8, see Fig. 2, and a stud'47 is secured-at the upper end of this lever and extends through a horizontal rearwardly and forwardly exthe -film guide are reciprocated when the cam cylinder 37 is rotated. The cam 38 and cam groove 45 are so formedand timed that when the cam cylinder is rotated in, a clockwise direction the film guide is positioned'with perforations of the films'30 and 31 in the filmguide' engaged with .the'pins 28 during the down stroke thereof. When stroke when the film guide is again moved rearwardly to engage the pins with perforations of the film. This action effects a step by step advance of the films.

Pivoted. upon a horizontal axis normal to the movement of the film guide, to a bracket secured to the rear face of thc plate 10 is a bell crank lever 51 having one of its legs extending horizontally in a rearward direction from the bracket and having its other leg extending upwardly from the bracket. See Figs. 2 and 6. A headed stud 52 is mounted for sliding movement in a forward and rearward direction in registered bores of the plate 10 and the flange of the element 9 and abuts the rear faceof the plate 12- and the forwardly facing side of the upper leg of the bell crank lever with its respective ends whereby when the hori zontal leg of the bell crank is moved up wardly the stud 52 is moved forwardly and moves the plate 12 forwardly away from the plate 10 against the influence of the spring 16 acting through the stud 14 as hereinbefore described. The upper wall of the portion 7 has a, front wall portion 53 extendingdownwardly therefrom at the rear of the plate 23 and in front of the lever 41.

See Figs. 1 and 3. Pivoted on a stud 54;

secured to the wall portion 53 at one side of the cam cylinder on a horizontal forwardly and rearwardly extending axis, and disposed at the rear of the wall portion" 53 is a lever 55 which extends over the cam .cylinder 37 and has a cam roller 56 mounted at its free end engaging a cam 57 formed on the cam cylinder between the cam 38 and cam groove45. The lever 55 underlies the i horizontal leg of the bell crank lever 51, and

when the lever 55 is moved upwardly the bell crank lever is moved thereby to move the studf53 forwardly whereby the plate 12 is moved forwardly away from the plate 10 as hereinabovedescribed. See Fig. 6. Thc

tively large opening 59 through which the said horizontal" leg {extends The cam 57 is so formed and timed with relation to the cam 38 and cam groove 45 that the plate 12 is moved toward the plate LO to clamp the film's when the pins 28 are at the lower end of their stroke and is maintained in such positionuntil the pins are re-eng'aged with perforations of the films .atyth'e upper'end' of their. stroke by the rearward movement of the film" guide after which the plate 12 is moved forwardly to release the films for movement during the downward stroke of the pins.

The casing 2 has a gear casing 61 extending forwardly at one side of the step by a step mechanism hereinabove described and mounted for rotation on this casing and respectively disposed above and below the film guide arefilm sprockets 62. An extension support 63 is secured to the casing 61 and extends upwardly therefrom, and mounted on this support above the upper sprocket 62 is a pair of film supply spools 64 and 65 which are provided with the usual pivoted retaining arms 66 for holding the film rolls in position on the spools. Supported from the standard 1 is a support 67 extending horizontally below the casing 61, and mounted on this support are film receiving spools' 68 and 69 which are provided with the usual pivoted retaining arms 70 for holding the film rolls on the hubs 71 of these spools.

The sprockets 62 are driven in unison, in a counter-clockwise direction in Fig. 1 by a gear train of usual construction, not shown, within the gear casing 61, which gear train is driven with the cam cylinder 37 by a gear 73 secured upon the shaft 35 just in back of the front wall of the lamp chamber 4] The hnbs7l of the film receiving spools 68 and 69 are yieldingly driven, in a clockwise di rection in Fig. 1, from the gear train above mentioned by a belt and pulley mechanism 74: of usual construction. The negative film 30 is fed from the spool 64 over the upper sprocket 62, through the film guide, over the lower sprocket 62'and onto the spool 68. The positive film 31 is fed from the spool 65 ,over the upper sprocket 62, through the film guide in superposed relation with the negative film over the lower sprocket 62 and onto the spool 69. Idler rollers 75 serve to retain the films on the sprockets 62- and are movable away from respectivesprockets 62 in a usual manner to permit convenient threading of the films. The films are looped between the upper and lower'sprockets 62 and the film guide to accommodate the step by step of the films through thefilm guide with the continuous movement thereof 'over the sprockets.

Secured to the inside surface of the front wall of the lamp chamber 4 and surrounding theopening of the guide 8 is plateinember 77 which has a vertical guide way 78 formed on the frontsurface'thereof which cooperates with the inner surface of the said front wall to form a vertical box guide for j purposes hereinafter described. See Figs. 1 and 7. The plate member 77 has an aperture 79 formed therein registering with the 1 I opening of'the' guide'8. Secured upon the shaft 35 just" in back of the gear 73 is a disk shutter'80 which sweeps by the rear surface of the plate member 77 over theaperture 79 thereof. This shutter is of the usual type employed in. step printing machines and has the. usual opening which permits printing light to be projected into the opening of the element 9*from an incandescent light 81, mounted in the lamp chamber 4 to the rear. of the shutter, when the shutter is passing through a portion of it's angular movement,- and which cuts off the light therefrom when passing through the remainder of its angular movement. This shutter makes one revolution to each cycle of the step by step-advancing mechanism-here inabove described, and isso tiniedthat light is permitted to be projected upon the films through the opening of the element 9 and the opening 18 of the plate during each rest period-of the-movement of the films and is cut off therefrom during advance of the films as is usual. v

Mounted for independent vertical movement in the box guide formed by the inner surface of the front wall of the lamp chamher and the guide way 78 of the plate member 77 is a pair of shutter plates 83 which have registerable apertures 84 therein through which light -,may pass from the aperture 79 into the opening of the element 9. Secured upon the top of the casing-'2 is ahorizontally disposed frame 85, and jour naled for pivotal movement in the'ends of this frame and extending in parallelism with the shaft'35 is a rock shaft 86, collars 87 secured to the shaft .86 and abutting the frame 85 providing. for end thrust of this shaft. The shutter plates '83 extend upwardly through an opening in the upper wall of the lamp chamber, and the upper ends of these plates have vertically elongated apertures 88 through. which the shaft 86 passes. The shaft 86 has adouble arm lever 89 secured thereon immediately in back 7 of the shutter plates, and crank studs 90 mounted onrespective arms of the lever engage respective 'slots 91 formed at opposite edges of respective shutter plates. See Fig. 7. Each shutter plate is cut away at the edge thereof opposite the slot 91, as designated at 92, to clear the crank stud of the other plate. The crank studs 90 are diametrically opposite with respect to the axis of the shaft 86, and angular movement of the a shaft moves the shutter plates in opposite di- The frame element '85 has a horizontal an axis passing through the shaft 86, and has a slot 98 at its lower end disposed diametrically with relation to the bore 97 and'lying in a plane, normal to the.

axis of the shaft 86. A cylindrical element 99 is mounted for longitudinal movement in eachbore 97 and has an adjustment plate 100 secured in a'diametrical slot at the lower end thereof, see Fig. 10, the adjustment plate being engaged in the slot 98 for vertical movement with the cylindrical element. See Figs. 8, 9, and 10. A pin 101 is secured in a diametrical aperture of the shaft 86 below each adjustment plate 100 and extends outwardly on opposite sides of the shaft. Each adjustment plate 100 has an intermediate slot 102 out in its lower edge directly over. the shaft so that it can be moved to the lower end of its stroke without abutting the shaft, and when each adjustment is moved downwardly the lower edge surfaces of the plate lying on opposite sides of the slot 102 thereof move against opposite ends of the respective pin 101 'and'in such movement angularly move the shaft 86 in either direction to a predetermined position which is effected when,

bothlower edge surfaces of the plate abut respective ends of the respective pin 101. The pins 101 are disposed in different angular positions on the shaft 86 so that downward movement of respective adjustment plates effects respective individual angular and each block has a ver- "tical bore 97 therethrough disposed on positions of the shaft. In Fig. 11 one pic 101 is shown in full lines and different angular positions of other of these-pins are shown in dotted lines. angular movement of the shaft 86 effects adjustment of the adjustable shutter device As hereinabove described,

comprising the shutter plates 83, and accordingly when the shaft 86 is angularly positioned by downward movement of an adjustment plate 100 the shutter plates arecorrespondingly adjusted. Thus individual actuation of each adjustment device, hereinabove described, eifects variance of the light to a predetermined degree.

Secured on each block 96 above the horizontal portion 94 of the frame 85-and in concentric relation with the bore 97 thereof is an open cored electro-magnet 104, and mounted for sliding movement in the core of each electro-magnet is a cylindrical armature piece 105 of suitable metal, the lower end of each of which is reduced and screw threaded into the upperend of the respective cylindrical element 99. See Fig. 8. A' "coiled compression spring 106 encircles the reduced lower end of each armature piece and abuts the downwardly facing shoulder thereof formed by the reduced lower end of the armature piece and the upper end of the block 96 with its oppositeends, and serves to return the armature piece, cylindrical element 99, and adjustment plate 100 tothe upper end of their'stroke and to maintain them there normally. Energization of each electro-magnet attracts the respective armature piece 105 downwardly and moves the respective adjustment plate 100 downwardly to cooperate with the respective pin' 101 to position the shaft 86 angularly as-hereinabove described.

Journaled for pivotal"'movement in the ends of the frame 85 in parallelism to the shaft 86 and disposed above the same and to one side of the blocks 96 is a second rock,

shaft 107, collars 108 being secured to the shaft 107 and abutting the frame 85 providing for end thrust of this shaft. A latch lever .109 is secured to the shaft 107 in a plane to one side and immediately adjacent each adjustment plate 100. Each latch lever has a lateral lu'g 110 at the free end thereof extending toward the respective cylindrical element 99, and the upper edge 111 of each lug is inclined downwardly and outwardly from the main portion of the lever to form a cam surface, and the lower edge 112 is inclined oppositely to form a lock surface. Each adjustment plate is' provided with a laterallyextending lug 113 lying in the plane of the rfesective latch lever and disposed on the si e thereof from which the lug 110 projects to cooperate with the lug 110 of the respective latch lever. A

lever 114 is secured to the shaft 107 'adjacent the rear end thereof and extends down; wardly from the shaft. A tension spring 115 has one end secured to the lower end of the lever 114 and has its other end secured to a stud 116 mounted in the end wall of the'frame 85.. This spring tends to move the shaft 107 in a clockwise direction in Fig. 8 to maintain the latch levers against the lugs 113. When the adjustment plates 100 are in their normal upper position the lugs 113 thereof are disposed above the lugs.

110 of respective latch levers 109, and when any adjustment plate is moved downwardly its lug 113 bearsagainst the upper edge 111 of the respective lug 110 and moves all the latch levers, against the influence of spring 115, outwardly away from their normal positions. The lug 118 of the downwardly moving adjustment plate then rides over the end of the respective lug1'10 and below the same, after which the spring 115 moves the latch levers back to normal position and the lower edge 112 of the respective lug engages the lug 113 of the downwardly moving adjustment plate from ahoveand locks this adjustment plate agains the respective pin of the spring 115 the previously locked adjustment plate is released and the respective spring 106 moves it upwardly to its normal position, the shaft 86 being re-adjusted by the downward movement of the second ads j ustment plate. This action is repeated with the downward movement of each adjustment plate.

Secured on the side of the guide-8 at the front end thereof is a circuit breaker box 118 formin an enclosure. See Figs. 1, 2, and

Withhi the enclosure of this box intermediate the front. and rear ends thereof is secured a vertically disposed block 119 of nonconducting material in which is permw nently embedded a plurality of vertically spaced pairs of wires 120 extending forwardly and rearwardly therefrom, and the wires of each pair of. which are horizontall spaced. These wires are formed of spar resisting spring metal, such as tungsten, and

extend forwardly landrearwardly of the block 119. The-front ends of the wires of each pair are turned toward each other, as

from each other so that when the front end of one wire is flexed toward its mate a contact is formed and so that when the one wire is released it will-spring back to nor- .mal positionkto'break the contact. Individudesignated at 121, and are normally spaced ally pivoted on a common vertical shaft 122,

secured to and extending between the upper and lower walls of the circuit breakerbox at the front' end thereof, is a plurality of vertically spaced bell crank levers 128. These bell crank levers are disposed in the horizontal plane of respective pairs of wires 120, and one leg of each extends rearwardly on the side of the respecti've'pair of wires opposite that on which the guide 8 lies. The other leg 'of each bell crank lever extends in a direction toward the guide 8 at right angles to the other leg thereof and has a rearwardly facing engaging surface 124'at its free end. When any of these bell crank.

leversis moved in a counter-clockwise direction in F1g. 2 the one wire of the respective palr is moved into contact with its mate; The

normal tendency of each wire 120 engaged with respective bell crank levers'is to move the respective bell crank lever in a clockwise direction in Fig. 2 against the outer wall of the box 118 which forms a stop therefor. Se

'end of the block 126 extends throughanaperture 128 in the plate- 10 at one side of the films in the guide and into' a recess 129 formed in .the rear surface of the plate 12.

Secured to and extending between the upper and lower walls of the block 126 at the extreme front end thereof is a vertically disposed shaft 131, and a plurality of vertically spaced levers 132 are individually pivoted on the shaft 131.. These levers are disposed ;.in the same horizontal'glanes as respective bell crank levers123, an extend rearwardly of the shaft 131 through the opening 127 to points alongside of respective bell crank levers. The rear ends of the levers 132 have forwardly facing en aging surfaces .133 adapted to engage surf aces124 of respective bell crank .levers 123. A plurality of springs 134 are secured to the outer wall 0 the block 126 and engage respective levers 132 to move and normally maintain them against" the inner wall of the block which serves as a stop therefor. When positioned against the inner wall of the block 126 the surfaces 133 of these levers are out of position to engage the surfaces 124 of respective bell crank levers, and when the levers 132 are moved outwardly from their normal posi-v tions they are moved into position to engage the surfaces 124 of respective bell crank levers. As will be noted the levers 132 reciprocate forwardly and rearwardly with the element 9 and the film guide as moved by the cam groove 45 when the cam cylinder 37 is rotated in the o eration of the machine. When any one 0 these levers 132 is positioned outwardly of its normal position forward movement of the element 9 and a film.

ide from their rearpositions will cause the surface 133 of this lever to engage the surface 124 of the respective bell crank lever and throu h this connection will pivotally move the luell crank lever in a counterclockwise direction in Fig. 2' and contact the respective pair of wires 120. The levers- 132 are shown in both positions of their movement in Fig. 2.

The hereinbefore-mentioned opening 128 in the plate 10 extends to the light opening 18 therein, and the levers 132 have lateral extensions 135 extending toward the light opening. The ends of these extensions have forwardly facing contact surfaces 136 disposed along the path of movement of the films over the marginal portion of the outer surface of the negative film in the film guide between the adjacent edge of the film and the. perforations adjacent; thereto. These contact surfaces lie in the plane of the film face engaging surfaceof the plate 10 when tioned marginal portion of the negative film.

These irregularities are disposed both with relation to the selection of certain levers 132 and with relation to the particular rest period in the movement of the films during which the irregularities are to register with the contacting surfaces 136 of respective levers 132, and operate to move respective levers132 out of normal position into position to engage the surfaces 133 of these levers" with the surfaces 124 of the respective bell crank levers 123 in a manner now to'be described.

-As, herein above described the films are f advanced step by step through thefilm guide .and the plate 12 is positioned away from the plate 10 during each advance of the films to permit free movement of the films and is; positioned adjacent the plate 10'to maintain the film'sin close superposed relation during each izest period during which the printing of the positive film is effected. The irregularities 137 are disposed to register with respective contact surfaces 136 during the respective rest periods. After the films come to rest and immediately after the film guide'has been moved rearwardly sufliciently so thatthe surfaces 133 of the levers 132 lie to the rear of the surfaces 124 of the bell .craiik levers 123 the plate 12 is moved toward the plate 10 and the irregularities 137 registering with respective contact surfaces.136 are projected rearwardly against respective contact surfaces 136 and move the respective levers 132 out of normal position into position to engage surfaces 133 of these levers with surfaces 124 of respective bell crank levers 123 as hereinbefore described. The plate 12 is 10 until after the element 9 is-moved for:

wardly which movement, as hereinbefore described, effects the closing of the selected releasing the lrregularities from respective contact surfaces 135, and the films are then advanced, the springs 134 returning the levers 132 after .the pressure-between the surfaces 133 thereof and the surfaces 124 of respective bell crank levers has been remaintained in its position adjacent the plate leased by rearward movement of the. element 9 and the fihn guide. The film face engaging surface of the plate 10 has a vertical groove 138 extending through the length thereof in line with the path of the irregularities 137 so that the irregularities pass through the film guidewithoutinterference and so that they do not interfere with move-- ment-of the plate 12 toward the plate 10. It will be noted that this mechanism operates in a very positive manner and thatathe irregularitiesare not subjected to undue wearor rubbing in the operation of the machine. It will be noted that the irregularities 137 are formed without breaking or cutting the film and that they may be pressed back into the normal plane of the film whereby correc:

v tions'may be easily made in the disposition is effected in, the following manner.

of the irregularities.

The ener ization of electro-magnets 104 is selectivey controlled by the circuit breaker devices comprising the pairs of wires"120,.hereinabove described, which circuit breakers are preferablyiless innumber than the number of electro-magnets. This selective control of the energization by a relatively smallnumber of circuit breal rrelrs 16 number of electro-magnets, and likewise the number of adjustment devices, is divisible by a divisor which when added to the quotient of such division gives a niunber less than the number of electro-magnets. In

the drawings twenty electro-magnets are shown and a divisor of this number and'the.

quotient of such division are respectively four and five, which when added together gives nine. Accordingly'l'there are nine pairs of wires 120, nine be crank levers 123, and nine levers 132. Referring to 12 the circuit connections relating the circuit breakers. with the electro-magnets are as fol lows. One-pole of a source of electricity is connected by a circuit connection 139 with one wire 120 of each of five of the pairs thereof. One wire of each of the remaining four pairs of wires 120 is connected by a circuit connection 140 with the other pole of the source ofelectricity. The other wires of each pair of the first mentioned group of pairs of wires 120 are eachconnected by're-l spective branch circuitconnections 141, 142;

.-justment devices and effecting a selective control thereof. Due to this arrangement two'circuit breakers must be closed at the same time arid the irregularities 137 are arranged in pairs to "effect simultaneous movement otrespective levers 132 out of normal position and to thereby.

effect simultaneous movement of respective circuit breakers out of their 'normalopen position to closed position. The circuit connections between the circuifbreakersand electro-magnets include detachable circuit connector devices 150 mounted on blocks 151 of insulating material mounted on top of the'casing. 2 below the horizontal portion 94 of the frame 85, see Figs. 8 and 9, and a detachable cover 152 isfitted over the frame 85, and parts related therewith. I A sheet of mica 153-is placed between each pair of wires 120 to prevent contact of the wires of different pairs.

It will be noted that each .lightchange is controlled at one point in the travel of the films and is not extending over a'portion of the feeding movement of the film so that light changes from any one degree to any other I may be effected" in extremely quick succession- And it will be noted further that a succession of operations'pf the light varying mechanism is not necessary to effect any desired light change.

\Vhile I have herein shown" and particu- 'larly described the preferred embodiment of my inventlon I do not'wishto be limited to the precise details of construction shown as changes may readily be made without de parting from the spirit of my invention, but having thus described my invention I claim as new and desire to secure by Letters Patent the following-: J 1. A photographic printing machine including feeding means operating constantly during the printing operation, a control member fed by said feeding means and having irregularities disposed in predeter minately selected arrangement thereon, a source'of printing light, means for varying the printing light to predetermined degrees including a plurality of separately actuable adjustment devices, a plurality of electromagnets for controlling actuation of respective adjustment devices, a plurality of circuit breaker devices, circuit connectionswhereby said electro-magnets are selectively controlled by said circuit breaker devices, said circuit breaker devices being normally in position to prevent actuation of said a I individually 'controlled, to be caused to move into and out offposition to effect actuation of said adjustment devices, by respective irregular ties of the control member whenitaisin respective positions of its travel.

2. A photographic printing machine including means for feeding superposed negative and positive films, the negative film hav-.

for va-ryin ing irregularities disposed in predeterminately selected arrangement thereon, means for projecting printing light upon a section of the path of the superposed films, means the light to predetermined" degreesinclu ing a plurality of separately actuable adjustment devices, a plurality of electro-magnetic devices for controlling actuation of respective adjustment devices, a plurality of circuit breaker devices,-and circuit connections whereby individual energization of said electro-magnetic devices is selectively controlled by said circuit breaker devices, said circuit breaker devices being normally in position to prevent actuation of said adjustment devices and individually controlled, to be caused to move into and out of position to effect actuation of said adjustment devices,- by, respective irregularities of the negative film when it is in respective positions of its travel.

3. A photographic printing machine including feeding means operating to feed at a regular rate during the printing operation, a control member fed thereby and having irre ularities disposed in predeterminately se ected arrangement thereon, a source of printing light, means for varying the printing light to predetermined degrees including a plurality of separately actuable adjustment devices of a divisible number having a divisor, which When added to the quotient of such vdivision gives a number less than the number of adjustment devices,

a plurality of electro-magnetic devicesequal in number to the number of adjustment devices adapted when energized to effect actuation of respective adjustment devices, a plurality ofcircuit breaker devices equal in number to the sum of said divisor and quotient and normally inopen position and individually controlled, to be caused to move into and out of closed position, by re.- spective irregularities ofthe control member when it is inrespective positions of its travel, and circuit connections connecting each electro-nragnetic device in series with v a different pair of circuit breaker devices;

4. A photographic printing machine including means for feeding superposed negative and positive films in printing relation, the negative film having irregularities disposed in predeterminately selected arrangement thereon, means for projecting printing light upon a section of the path of the superposed films, means for varying the printing light to a plurality of predetermined degrees including a plurality of separately actuable adjustment devices of a divisible number-having a divisor which when added to the quotient of such division gives a number less than the number'of adjustment devices, a plurality of electro-magnets equal in number to the number of adjustment devices adapted when energized to effect actuation of respective adjustment devices, a plurality of circuit breaker devices equal in number to the sum of said divisor and quotient and normally inopen position and i individually controlled, to be caused to move into and out of closed position, by respective irregularities of the negative film when it is in respective positions of its travel, and

circuit "connections connecting. each electro-. magnetic device in series with a different pair of circuit breaker devices.

5. A photographic printing machine including a'film guide having a light opening therein, a negative film having irregularities disposed in predeterminately selected arrangement thereon corresponding with differences in densities-of the same, means forfeeding the negative film and apositive film in superposed printing relation therewith through said' film guide, means for varying the light projected into said opening to a plurality of predetermined degrees including a plurality of separately actuable adjustment devices of a divisible number having a; divisor which when added to the quotientiof such division gives a number 'less than the number of adjustment devices,

a plurality of electro-magnetic devices equal in number to the number of adjustment devices adapted when energized to effect actuation of respective adjustment devices, a plurality of circuit breaker devices equal in number. to the sum of said divisor and quotient and normally in open position and individually controlled, to be caused to move into and out' of closed position, by respective irregularities of the negative film when it is in respective positions of its travel, and circuit connections connecting" each electro-magnetic device with a different pair of circuit breaker devices.

6. A photographic printing machine in- -cluding feeding means, a source of light,

means for varying the light to predeter mined degrees including a plurality of separately; reciprocable adjustment elements,-

means for individually reciprocating said adjustment elements including a plurality of electro-magnetic devicesya plurality of circuit breakers individually controlled-by a control member fed by said feeding means,

tive adjustmentelements to the opposite ends of their strokes, a plurality of circuit breakers normally open and individually controlled, to be moved into and out of closed position, by respective irregularities of the control member when it is in respec-- tive positions of its travel, and c1rcu1t connections whereby said electro-magnets are selectively energized by closure of respective CllClllt breakers.

8. A photographic printing machine 1ncluding a film guide having a light opening separately reciprocable adjustment elements,

a plurality of elec'tro-magnetic devices for controlling ,actuation of respectlve adjustment elements, a plurality of circuit breakers individually controlled by respective irregularities of the negative film when it is in separately reciprocable adjustment elements yieldably pressed into one end of their strokes, means under the control of a control member fed by said feeding means for effecting intermittently individual actuation of said adjustment elements to the opposite end of their strokes, and releasable latch means for automatically locking any adjustment element at said opposite end of its stroke and operated by the movement of any adjustment element toward said opposite end of its stroke to release a previously locked adjustmentelement. i

10. A photographic printing machine in cluding feeding means operating constantly during the printing operation, a control member fed thereby and having irregularities disposed in predeterminately selected arrangement thereon, a source of light, means for varying the light to predetermined degrees including aplurality of separately reciprocable adjustment elements yieldably pressed into one end of their strokes, a plurality of electro-magnetic devices for moving respective adjustment elements to the opposite end of their strokes, a plurality of circuit breaker devicesvnormally open and individually controlled, to be moved into and out of closed position, by respective irregularities of the control member when it is in respective positions of its travel, and releasable latch means for automatically locking any adjustment element at said opposite end of its stroke and operated by-the movement of any adjustment element toward said opposite end of its stroke to, release a previously locked adjustment element.

11. A photographic printing machine including means for feeding superposed negative and positive films, the negative film having irregularities disposed in predeterminately selected arrangement thereon, means for projecting printing light upon a section of the path of the superposed films-means for varying the light to predetermined degrees including a plurality of separately reciprocable adjustment elements yieldably pressed into one end of their strokes, means for efiecting actuation of said adjustment elements including a plurality of control devices selectively controlling individual actuation of said adjustment elements to the opposite end of their strokes and individually controlled, to effect intermittent actuation of said adjustment elements, by respective irregularities of the negative film when it is in respective positions. of its travel, and releasable latch means for automatically locking any adjustment element at said opposite end of its stroke and apeated bythe movement of any adjustment elementtoward said opposite end of its stroke to release a previously locked adjustment element.

12. A photographic printing machine including feeding means operating constantly during the printing operation, a source of printing light, an adjustable shutter device, means for adjusting said device to predetermined degrees including a plurality of separately reciprocable adjustment elements and a pivoted device operatively connected with said shutter device and adapted to be angularly moved to individual predetermined positions by movement of respective adjustment elements to one end of their strokes, and means under the control ofa control member fed by said feeding means for efiecting intermittently individual ac,- tuation of said adjustment elements to said one end of their strokes.

13.' A photographic printing machine including feeding means, a control member fed by said feeding meansandrhaving irregularities disposed in predeterminately SE'. lected arrangement thereon, a source of printing light, means for varying thev light to predetermined degrees includlng a plurality of separately reciprocable adjustment elements and a pivoted device adaptedv to be angularly moved to individual .predetermined positions by movement of res ective adjustment elements to one end-of t eir strokes, a plurality of electro-magnets for moving respective adjustment elements tocircuit breakers normally open and individually controlled, to be moved into and out of closed position, by respective irregularities of the control member when it is in respective positions of its travel, and circuit connections whereby said electromagnets are selectively controlled by said circuit breakers.

14; A photographic printing machine'ineluding a film guidehaving a light opening therein, means for feeding superposed positive and negative films through said guide, means for varying the light to predetermined degrees including a plurality of separately reciprocable adjustment elements yieldably pressed to one end of their strokes and apivoted device adapted to be angularly moved to individual predetermined positions by movement of respective adjustment devices to the opposite endof their strokes, releasable latch means adapted to lock automatically any adjustment element at said opposite end of its stroke and operated by the movement of any adjiustment element toward said opposite on of its stroke to release a previously locked adjustment device, and means under the control of one of said films for effecting intermittently individual actuation of said adjustment elements to said opposite end of their strokes.

15. A photographic printing machine including feeding means, a source of printmg light, a control member fed thereby and having irregularities'disposed in predeterminately selected arrangement thereon, means for varying the light to predetermined degrees including a plurality of separately reciprocable adjustment elements yieldably pressed into one end of their strokes and a pivoted device adapted to be,

' angularly moved to individual predetermined positions by movement of respective adjustment elements to the opposite end of their strokes, releasable latch means adapted to lock automatically any adjustment element at said opposite end of its stroke and operated by the movement of any adjustment element toward said opp0site.end of its stroke to release a previously locked adjustmentelement, and means for efliecting actuation of said adjustment elements to said opposite end of their strokes including a plurality'of devices selectively controlling individual movement of said ad- 'justment elements to said opposite end of their-strokes and individually controlled, to

effect intermittent actuation of said adjustment elements to saidopposite end of their strokes, by respective irregularities of the control memberwhen it is in respective .positions of its travel.

16. A photographic printing machine includingstep by step feeding means adapted to feed a control member having an irregularitythereon, an element adapted to each other laterally of the feeding movement of the control member, and means operating in timed relation with said feeding means and adapted to yieldingly effect relative movement of said element and control member toward each other laterally of the. feeding movement of the control member and to effect relative movement of the same away from each other during each rest period in the feeding movement of the control member. t

17 A photographic printing machine including step by step feeding means, member fed thereby and having -an irregularity thereon, a support, an element movably mounted thereonfor movement to and away from the control member laterally of the feeding movement of the control member and yieldably pressed into a position adjacent the control member, said element being adapted to register with said irregularity when the control member is in U .ment of the control member.

18. A- photographic printing machine including'step by step feeding means adapted to feed a control member having'a laterally projecting irregularity disposed in predeterminately selected position thereon, means operating in timed relation with'said feeding means adapted toposition the control member laterally .of the feeding movement thereofin the direction in which said irregularities project and to release the same from such position during each rest period of the feeding means, and a movable element yieldably pressed into a normal position and adapted to be movedout of normal position by the irregularity of the control L member when registering therewith when said second mentioned means laterally 'posi'- tions the control member,

19; A photographic printing machine including a guide comprising opposing face trol member are relatively moved toward control one end of its movement and adapted to be moved out of the aforementioned end of its movement by said irregularity registering therewith when said movable guide plate is moved toward the other guide plate.

20. A photographic printing machine including step by step feeding means, a control member fed thereby and having irregu larities disposed thereon in predeterminately selected arrangement thereon, a support, a plurality of elements mounted on said support for individual movement laterally of the feeding movement of the control member and yieldably pressed to the end of their movement adjacent the control member, said elements being adapted to register with respective irregularities of the control member during respective rest periods in itsfeeding movement and adapted to be caused individually to assume abnormal relation with the control member by respective registering irregularities when said support-and control member are relatively moved toward each other during respective rest periods in the feeding movement of the control member, and means operating in timed relation with said feeding means adapted'to relatively move said support and control member towards each other and to release during each rest period in the feeding movement of the control member. j

21. A photographic printing machine including stepby step feeding means adapted to feed a control member having laterally projecting irregularities I disposed in predeterminately selected arrangement thereon, a support, aplurality of levers pivotally mounted on saidsupport for. individual movement laterally of the feeding movement of the control member and yieldably pressed to the end of their'movement adjacent-the control member, said levers being adapted to register with respective irregularities of the controlmember during re spective rest periods in its feeding move ment and adapted to be individually moved out of said aforementioned end of their movement by respective registering irregularities when said support and control member are relatively moved toward each other during respective rest periods in the feeding movement of the control member. and means operating in timed relation with said feeding means adapted to relatively move said support and control member toward each other and to release during each rest period in the feeding movement of the control member.

22. A photographic printing machine eluding a film guide comprising opposin face guide plates disposed opposite respective faces of a film guided thereby, one of said guide plates being movable to and away from the other guide plate, step by step feeding means adapted to feed a film through said guide, said film having irregularities projecting laterally from a face thereof and disposed in predeterminately selected arrangement thereon, means operating in timed relation with said feeding means and adapted to move said movable guide plate toward and away from the other guide plate during each rest period in'the feeding movement of the film, and a plurality of elements mounted for individual movement and yieldably pressed to one end of their movement, said elements being adapted to register with respective irregularities during respective rest periods in the feeding of the film and adapted to be moved individually out of the aforemen tioned end of their strokes by respective registering irregularities when said movable guide plate is moved toward the other guide plate.

23. A photographic printing machine including a reciprocable guide comprising opposin face guide plates, one of which is movafile to and away from the other plate, a perforation engaging advancing member reciprocable in a plane normal to the plane of reciprocation of the guide, means for reciprocating said guide and said advancing member-in timed relation to effect step by step advance of perforated strip in said guide, said strip having an irregularity projecting from a face thereof and disposed in a predeterminately selected position thereommeans operating in timed relation with said means adapted to move said movable guide plate toward the other guide plate before and to move the same away from said other guide plate after one stroke of the reciprocation of the guide during each rest period in the feeding movement of the strip,

a device mounted to reciprocate with the lll') guide and movably mounted with respect 'thereto and yieldably pressed into one end of its movement, said device being adapted to be moved out of a normal position by said irregularity registering therewith when said movable guide plate is moved toward the other guide plate, and a circuit breaker device normally in one position and adapted to be moved to the opposite position thereof p the guide.

- 24. A photographic printing machine in-- predeterminately ab e guide eluding a reciprocable guide comprising opposing guide plates, one of which is movable to and away perforation engaging advancing member reciprocable in a plane normal to the plane .of reciprocation of the guide, means for reciprocating said guide and advancing member in timed relation to effect step by step advance of a perforated strip in said guide, said strip having irregularities disposed in selected arrangement thereon, means operating in timed relation wiyh said means adapted to move said movplate toward the other guide plate before and to movethe same away from said other guide plate after one stroke of the reciprocat on of the guide during each rest period in the feeding movement of the strip, a plurality of devices mounted to reciprocate with'the guide and individually movable with respect thereto and yieldably pressed into one end of their movement, each device being adapted to assume an abnormal relation with the strip when a respective irregularity of the strip registers therewith during movement of said movable guide plate towarv plurality of circuit breaker devices .yieldably pressed into one position and adapted to be moved individually to the opposite position thereof by respectivev devices 1n said abnormal relation during respective aforementioned strokes of the guide.

2,5. A photographic printing machine including a perforated strip having laterally rejecting irregularities projecting from a ace thereof and disposed in predeterminately selected arrangement thereon, a guide reciprocable in a path normal to the faces of the strip and comprising opposed guide plates disposed oppositerespective faces of oneiof said guide plates being movable to and away from the other plate,

the strip,

a perforation engaging advancing member reciprocable in a plane normal tothe plane of reciprocation of the guide, means for reciprocating said guide and advancing member in their respective and in timed relation to effect step by step advance of the strip, -means operating in timed relation with said means adaptedto move said movable guide plate toward the other guideplate before and to move the same away from said other guide plate after one stroke of the reciprocation of the guide during each rest period in the feeding movement of the strip, a plurality of devices from the other plate, a

. position (1 the other guide plate,.ianda.

planes of movement moved out of said end of its movement by a respective registering irregularity of the v strip during movement of said movable guide plate toward the other guide plate, and a plurality of circuit breaker devices yieldably pressed into open position and adapted to be individually moved to closed position by respective devices out of normal during respective aforementioned strokes of said guide.

26. A photographic printing machine including a film guide comprising opposing face guide plates 1 ing opposite respective outer faces of-peri brated superposed positive and negative films and one of said plates having a lightopening therein, the negative film lying next to the guide plate having the light opening therein and having laterally terminate y selected order along the same at the side of the light opening and projecting toward the guide plate having the light opening, said guide being reciprocable in a path normal'to the faces of the films and one of said guide plates being movable to, and

away from the other guide plate, a perforation engaging advancing member reciprocable in a plane normal to the plane of reciprocation of the guide, means for reciproeating said guide and advancing member in their respective planes ofmovement and'm timed relation to effect step by step advance of the films, means operating in timed relation with said means adapted to move said movable guide plate-toward the other guide plate before and to move the same away from said other guide plate after one stroke of the reciprocation of theguide during each rest period in the feeding movement of the films, a plurality of devices mounted to reciprocate with the guide and and yieldably pressed into one end of their movement, each device being adapted to be moved out ofsaid end of its movement by a respective-registering irregularity of the ne ative film during movement of'said movindividually movable with respect thereto I ab e guide plate toward the other guide plate, and a plurality of circuit breaker devices ieldably pressed into open position and a apted to be individuall closed by respective devices out of norma position during respective aforementioned strokes of said guide.

In witness whereof I hereunto afiix my signature this 22nd day of Jul 1921 A. D. a ALBERT .s. oWnLn; 

